This is just talking about developers having to include a link to their privacy policy in the respective field in the App Store/Play Store

This is why privacy policies are a virtue signaling joke. They all start with "we respect your privacy" which is so objectively, categorically, false 99% of the time that it should be considered illegal (e.g. false advertising) for the org to even associate those words with their business, in any capacity. Every evilcorp has one policy that is hundreds of pages long and covers everything they ever have done, and ever will do, across every subsidiary and product of the entire umbrella organization. The whole privacy policy system is designed so every consumer rubber stamps them and legally absolves the corporation for everything they will ever do, because it's impossible for any human to read or understand them. By impossible I mean literally impossible – you would need more than a lifetime to read them, let alone comprehend them...

If we didn't live in a capitalist dystopia, privacy policies wouldn't be needed most of the time, because data laws qould be so comprehensive they explicitly apply for 99% of interactions, and every system would be designed from the ground up for zero trust (e.g. all data is E2EE). But in the 1% of cases where they are needed they're dynamically generated from templates, based on a users current preferences/settings. The "use X app" policy would be different from the "integrate all of my other various PII linked services to my account" policy. In the case of a completely offline calculator, with no API, and no telemetry/analytics (or them all disabled by default) the policy would not even be a link; just a one-liner that says "App can be used with zero data collection". If you download the app and choose to enable a data collection setting, that's when you would be shown the policy related to the specific data points that setting relates to.